若A+(3x²-y²)=4x²-xy+y²,则A等于?(A)7x²+xy+2y²(B)x²+xy+2y²(C)7x²-xy+2y²(D)x²-xy+2y²
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若A+(3x²-y²)=4x²-xy+y²,则A等于?(A)7x²+xy+2y²(B)x²+xy+2y²(C)7x²-xy+2y²(D)x²-xy+2y²
若A+(3x²-y²)=4x²-xy+y²,则A等于?
(A)7x²+xy+2y²
(B)x²+xy+2y²
(C)7x²-xy+2y²
(D)x²-xy+2y²
若A+(3x²-y²)=4x²-xy+y²,则A等于?(A)7x²+xy+2y²(B)x²+xy+2y²(C)7x²-xy+2y²(D)x²-xy+2y²
A=(4x^2-xy+y^2)-(3x^2-y^2)=x^2-xy+2y^2
D
D
D
选D 小妹妹